SUMMARY OF RESULTS. 689 



rises and the post-Christmas rise, are all clearly shown in this curve. 

 The striking increase in body-weight following the resumption of 

 normal diet is also prominent. 



Although the net caloric intake has been shown on the individual 

 body-weight curves, the average values for these 9 men are here given 

 in blocks closely associated with the average body-weight curve. The 

 difficulty of securing evidence regarding the net caloric intake at the 

 maintenance weight level is more clearly brought out in this composite 

 curve than with the individual curves, for one would expect a smooth- 

 ing of the curve, indicating even more than ife here shown that weight 

 maintenance was obtained in December and again in the latter part 

 of January. Even with the best possible food adjustment, which it 

 will be recalled was specifically planned to maintain the weight at a 

 constant level, we find that the average value for the 9 men shows 

 considerable fluctuation. Yet we see no reason for altering our original 

 statement that during December and the latter part of January these 

 men were essentially at weight maintenance. As was pointed out in 

 the earlier discussion, a change of 1 kg. may not be significant, owing 

 to the large water content of the body, and it is by no means a certain 

 indication of changes in organized body-tissue. The energy intake at 

 the weight level is for the December period 2,200 calories and for the 

 January period 1,950 calories. The average for these 9 men for these 

 two periods is therefore 2,075 calories, which is but little above the 

 average value for the entire squad, namely, 1,967 calories. 



It is important to note that in this chart, as in the individual 

 body-weight charts, the net energy intake for the first few days in 

 October, which is here represented as 3,100 calories, should in all 

 probability be nearer 4,000 calories, and would in consequence normally 

 occupy a higher block and correspond more nearly to the general 

 trend of the body-weight curve. 



In spite of the striking changes in the net energy intake, as shown 

 by the blocks at the bottom of the chart, the nitrogen in the food 

 represents fluctuations by no means comparable to the total energy. 

 The general contour of the series of blocks indicates that the nitrogen 

 of the diet was not on a particularly low level, but averages about 10.5 

 grams. The section of the curve for the last few days of the experiment 

 shows a distinctly high nitrogen intake, this being higher than at any 

 other time during the observation, save for the first week of uncon- 

 trolled normal diet. 



In striking contrast to the nitrogen in the food is the rather level 

 curve for the nitrogen in the urine; that is, in spite of the relatively 

 enormous alterations in nitrogen in intake, we find the nitrogen in 

 urine remains reasonably constant, the lowest point of the curve 

 appearing a few days following November 26. Here again it is well 

 to emphasize the fact brought out in the study of both Squads A and B 



